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An infrared study of Roberts 22

Published online by Cambridge University Press:  25 May 2016

F.J. Molster ,
L.B.F.M. Waters ,
T. de Jong ,
T. Prusti ,
A. Zijlstra  and
M. Meixner
F.J. Molster
Affiliation:
1Anton Pannekoek Institute Univ of Amsterdam
L.B.F.M. Waters
Affiliation:
1Anton Pannekoek Institute Univ of Amsterdam 2SRON Groningen
T. de Jong
Affiliation:
1Anton Pannekoek Institute Univ of Amsterdam 2SRON Groningen
T. Prusti
Affiliation:
3ESA Villafranca
A. Zijlstra
Affiliation:
4ESO Garching
M. Meixner
Affiliation:
5Dept. of Astronomy Univ of Illinois

Extract

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Roberts 22 (= AFGL 4104) is a peculiar proto-planetary nebula. Its central star has spectral type A2Ie. An OH maser was detected by Manchester et al. (1969), indicating that the shell is oxygen-rich. However Polycyclic Aromatic Hydrocarbons (PAH) features were observed as well (Allen et al., 1982; Cohen et al., 1993), indicating that carbon rich material is also present. In this poster we present new IR data (images and spectra) of this peculiar star and propose an explanation for this curious behaviour.

Type
V. From AGB to Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 361
Copyright
Copyright © Kluwer 1997 

References

Allen, D.A. et al, 1982, MNRAS 199, 1017.CrossRefGoogle Scholar
Barnbaum, C., et al., 1991, A&A 251, 79.Google Scholar
Cohen, M., et al., 1989, ApJ 341, 246.CrossRefGoogle Scholar
Manchester, R.N. et al. 1969, Astrophys. Lett. 3, 11.Google Scholar
Waters, L.B.F.M., et al. 1996, A&A to be published.Google Scholar